One morning, as I followed pro shooter Andy Katz around, he used two bags: Andy arrived on the scene with a Pro Roller x100. Then he moved a few items from the roller to a Pro Messenger 180 AW for a portrait shoot. I tagged along to capture him at work. You can read all about it, and see the photos, in this blog post. Andy's site is http://www.andykatzphotography.com/
Photographers on the go need to stay organized without missing a step. I recently spent a morning trying to keep up with pro shooter Andy Katz while he moved from task to task.